Abstract
In this paper, two types of dual permanent magnet (PM) machines, i.e., stator slot dual-PM (SSDPM) machine and split-tooth dual-PM (STDPM) machine, are investigated and compared. Both machines have consequent pole structure with Halbach array PMs. Their difference lies in the position of stator PM. The SSDPM machine has Halbach array PMs in the stator slots, while the STDPM machine has PMs between the split teeth. Torque characteristics, i.e., average torques and torque ripples, of different slot/pole number combinations of the two machines are compared. The 24 stator slots/20 rotor slots/4 armature pole pair (24S20R4Pa) SSDPM machine with distributed windings and the 24 stator slots/10 rotor slots/4 armature pole pair (12S20R4Pa) STDPM machine with concentrated windings are compared under both open-circuit and on-load conditions. The results show that the SSDPM machine is more competitive by delivering higher torque density and higher power density.
Highlights
Flux modulation (FM) machines have been widely investigated due to their high torque density [1,2,3,4,5]
Research shows that different flux modulation (FM) machines, i.e., flux-switching permanent magnet (PM) (FSPM) machines, flux reversal PM (FRPM) machines, doubly salient PM (DSPM)
Rotor PM FM machines mainly refer to vernier PM (VPM) machines, which can produce high torque at low speed, albeit with poor power factor [15,16]
Summary
Flux modulation (FM) machines have been widely investigated due to their high torque density [1,2,3,4,5]. They can be a strong competitor for interior permanent magnet (IPM) machines. Machine, together with consequent pole rochine and split-tooth dual-PM (STDPM) machine, together with consequent pole rotors, tors, are investigated and compared. On one hand, they can deliver very high torque.
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